[ericwy]

Originally Posted by QUICK-SILVER

ericwy,
The chevy article old school new school, is old school. Fine tuning carbs, has been around since carbs. A performance tune up, carb included, on an engine is for best power. Best power comes from burning fuel with the highest efficiency possible. Highest efficiency possible is going to give you the best gas milage.

Less load on engine is going to give you better milage. You found that out changing transmissions, engine doesn't labor as much taking off with lower gears.

When you start thinking about rearends for highway cruising, you will want to know your engines sweet spot, too much can be as bad as too little.

carb 101 another day
it's much easier than the chevy article.

Agreed on the historic nature of the chevy article, and I dont plan on modifying my
Holley PV channel restrictions and air bleeds etc... The two carbs I have to work with are a 4165 DP and the 4175 vac sec. Both are "emission legal" street versions with reverse idle mixture control. I am planning to check its current state of tune esp for cruise and part throttle.

As far as this thread goes its about getting the optimal gearing. How do you determine this? My engine peaks tq about 3400 but its a flat peak. I cant seen cruising at 3400 rpm is going to get very good mileage vs at 2000.